36,Interferometers works on the principle of?,
Formation of gas cap,
Wheatstone bridge,
Infraradiation,
Optical properties,
37,One kg of methane in burning evolves .....kcal of heat?,
10000,12000,13600,15000,
38,The minimum voltage at which the methanometer works with accuracy is?,
1 v,1.5 v,2.2 v,3 v,
39,The wetbulb temparature in development faces should not exceed?,
30 deg c,33.5 deg c,35 deg c,38 deg c,
40,The minimum quantity of air per person in deg III mine is?,
6 cu.m/min,8 cu.m/min,10 cu.m/min,12 cu.m/min,
Ans: 4, 3, 3, 2, 2
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